The large cross looks as though it is hanging from the top of the wall.
I worked really hard for this little detail so here goes. The large cross you see is the shadow of the cross from the smaller church you saw in yesterday's image. I had to wait until the sun was setting and the angle was just right to try and capture is fully on the white side of the top portion of San Xavier Del Bac.
Check out photos of Machu Picchu in Peru at Viva la Voyage!